Bently Nevada 330104-00-17-90-02-00 Proximity Probe – 3300 XL Series

Bently Nevada 330104-00-17-90-02-00: 8 mm Eddy-Current Proximity Probe for Continuous Shaft Monitoring in API 670 Machinery Protection Systems

The Bently Nevada 330104-00-17-90-02-00 is an 8 mm diameter eddy-current proximity probe belonging to the 3300 XL Series — a platform engineered specifically for non-contact, continuous measurement of radial vibration, axial position, and differential expansion on rotating machinery. Unlike piezoelectric accelerometers that measure surface acceleration, this probe operates on the principle of electromagnetic induction: a high-frequency oscillating magnetic field generated at the probe tip induces eddy currents in the conductive target surface, and the resulting impedance change is converted by the paired Proximitor driver into a DC voltage proportional to the air gap distance. This mechanism delivers a DC-coupled, zero-RPM-capable output — a fundamental requirement for machinery protection systems that must detect both dynamic vibration and static shaft position simultaneously.

Within a control loop, the 330104-00-17-90-02-00 occupies the sensing node of a three-component measurement chain: probe → extension cable (330130 series) → Proximitor driver (330180-X1-05 or equivalent). The probe’s 5 m armored cable (suffix -17) and high-temperature rating to +177 °C (suffix -90) make it suited for installation in bearing housings and seal areas where ambient temperatures and mechanical vibration are severe. The 2-pin MIL-C-5015 style connector (suffix -02) provides a positive locking interface that resists loosening under continuous vibration loads.

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Technical Parameters

Hardware Logical Analysis

The 330104-00-17-90-02-00 is not a standalone transducer — it is a calibrated impedance element within a closed-loop measurement system. Understanding its hardware architecture clarifies why substitution with non-matched components degrades measurement integrity.

Eddy-Current Sensing Coil Geometry: The probe tip houses a precision-wound coil embedded in a ferrite core. The coil geometry is matched to the 8 mm diameter specification: a larger coil increases the sensing field diameter and improves signal-to-noise ratio at the cost of spatial resolution. The 8 mm format represents the standard for turbomachinery shaft monitoring where journal diameters typically range from 50 mm to 300 mm, providing a probe-to-shaft diameter ratio that ensures the eddy-current field samples a representative arc of the shaft surface without excessive averaging.

EMC Design and Shielding Architecture: The integral 5 m armored cable uses a triaxial construction: the center conductor carries the RF oscillator signal to the coil, the inner shield is driven at the same potential as the center conductor (guard drive) to eliminate cable capacitance from the measurement, and the outer shield provides EMI rejection. This guard-drive topology is critical in high-voltage switchgear environments and near variable-frequency drives (VFDs), where common-mode interference at frequencies from 2 kHz to 20 kHz would otherwise corrupt the gap voltage output. The armor jacket provides additional mechanical protection against abrasion and rodent damage in field installations.

High-Temperature Material Stack: The suffix -90 designates a high-temperature construction in which the coil former, potting compound, and cable insulation are rated to +177 °C continuous. Standard probes (suffix -00) are rated to +121 °C. In steam turbine bearing housings where bearing metal temperatures can reach 120 °C and local hot spots near steam seals can exceed 150 °C, the -90 variant provides a 27 °C thermal margin that prevents insulation degradation and sensitivity drift over the service life of the probe.

Calibration Traceability: Each probe is factory-calibrated as a matched pair with a specific Proximitor driver against an AISI 4140 steel target. The calibration data — gap voltage vs. distance curve, sensitivity coefficient, and linearity error — is recorded and traceable to the serial number. This traceability is a mandatory requirement under API 670 Section 5.3, which specifies that the complete measurement loop (probe + cable + driver) must be calibrated as a system, not as individual components.

System Integration Benefits

• DC-coupled output enables zero-speed detection: The −1 VDC to −10 VDC output is valid at 0 RPM, allowing the protection system to monitor shaft position during startup, coastdown, and barring-gear operation — conditions where AC-coupled sensors produce no usable signal.
• Deterministic latency in the measurement chain: The eddy-current sensing mechanism has no moving parts and no resonant frequency limitation below 10 kHz, providing a flat frequency response from DC to beyond the Nyquist frequency of standard 3300/3500 series monitors (sampling at 20 kHz). This ensures that sub-synchronous instabilities (oil whirl at 0.43–0.48× running speed) and super-synchronous harmonics are captured without phase distortion.
• Dual-measurement capability (vibration + position): A single probe simultaneously delivers dynamic vibration data (AC component, filtered by the monitor) and static gap position (DC component). This eliminates the need for separate position transducers on machines where both radial vibration and shaft centerline position must be trended.
• Plug-compatible with 3300/3500 monitor infrastructure: The probe output is directly compatible with Bently Nevada 3300/16, 3500/40M, and 3500/42M monitor cards without signal conditioning adapters, reducing panel wiring complexity and eliminating potential ground loop paths.
• Diagnostic transparency via gap voltage trending: The DC gap voltage is accessible as a separate channel on 3500 series monitors. Trending this value over time reveals bearing wear (decreasing gap), probe fouling (erratic gap), and thermal growth patterns — providing maintenance intelligence beyond simple alarm/trip functions.
• Intrinsically safe variants for hazardous area compliance: The 330104 series includes IS-certified variants (Zener barrier or galvanic isolator required) for Zone 1 / Division 1 installations in petrochemical and LNG facilities, allowing the same probe form factor to be deployed across both general-purpose and hazardous-area machinery trains.
• Armored cable reduces installation failure modes: The 5 m integral armored cable eliminates the field-assembled probe-to-extension-cable junction that is a common failure point in vibration monitoring systems. Fewer junctions mean fewer impedance discontinuities, lower susceptibility to moisture ingress, and reduced maintenance intervention frequency.
• API 670 compliance preserves insurance and regulatory standing: Machinery protection systems built with certified, traceable components satisfy the requirements of API 670 (4th and 5th editions), IEC 61511 (functional safety), and insurance underwriter specifications for rotating equipment in refinery and power generation service. Using non-certified substitutes can void equipment warranties and create liability exposure during incident investigations.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-00-17-90-02-00 unit supplied by siemensplc.com is sourced through verified channels with full OEM traceability. Prior to dispatch, each unit undergoes incoming inspection against the factory calibration certificate: gap voltage at nominal gap (1.0 mm), sensitivity verification at ±10% of 7.87 V/mm, and cable continuity/insulation resistance check. Units that do not meet OEM specifications are quarantined and not offered for sale.

Logistics operations are based in Xiamen, China — a major port city with direct air freight connections to Singapore, Dubai, Frankfurt, Los Angeles, and Tokyo. Standard export packaging uses anti-static foam inserts within double-wall corrugated cartons, with the probe tip protected by a machined plastic cap to prevent coil damage during transit. Shipment options include:

• Express air (DHL / FedEx / UPS): 3–5 business days to most destinations worldwide.
• Economy air freight: 7–12 business days, suitable for non-urgent replenishment orders.
• Sea freight (LCL/FCL): Available for bulk orders of 10+ units; transit time 15–30 days depending on destination port.

Export documentation includes commercial invoice, packing list, certificate of origin, and — upon request — a Certificate of Conformance (CoC) referencing the OEM part number and serial number. All shipments are covered by cargo insurance. The 12-month warranty covers manufacturing defects and calibration drift beyond OEM tolerance; it does not cover damage from incorrect installation, target material substitution, or operation outside the rated temperature range.

Contact Information

📧 Email: [email protected]
💬 WhatsApp: +86 18359268345
🌐 Web: siemensplc.com
📍 Location: Xiamen, China
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